Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China

Abstract The large-scale extraction of coal resources in the western mining areas of China has resulted in a significant loss of water resources, which is a challenge for coordinating resource extraction with ecological preservation in the mining areas. Although underground reservoir technology can...

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Main Authors: Zhijie Wen, Pengfei Jiang, Zhenqi Song, Yujing Jiang, Jinhao Wen, Suolin Jing
Format: Article
Language:English
Published: Springer 2023-10-01
Series:Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Subjects:
Online Access:https://doi.org/10.1007/s40948-023-00677-2
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author Zhijie Wen
Pengfei Jiang
Zhenqi Song
Yujing Jiang
Jinhao Wen
Suolin Jing
author_facet Zhijie Wen
Pengfei Jiang
Zhenqi Song
Yujing Jiang
Jinhao Wen
Suolin Jing
author_sort Zhijie Wen
collection DOAJ
description Abstract The large-scale extraction of coal resources in the western mining areas of China has resulted in a significant loss of water resources, which is a challenge for coordinating resource extraction with ecological preservation in the mining areas. Although underground reservoir technology can effectively solve this problem, measuring the storage capacity of underground reservoirs through engineering experiments is costly and time-consuming. Currently, there is a lack of accurate, reliable, and low-cost theoretical calculation solutions, which greatly restricts the promotion and application of underground reservoir technology. The theoretical calculation methods for underground reservoir capacity were studied based on parameters from the Shendong mining area in China. A water storage structure model for coal mine underground water reservoirs was established, taking into account the settlement boundaries of the bedrock and loose layers in shallow coal seams, based on the key layer theory and the spatial structure model of the mining roof. The mathematical expression for the load on the coal-rock mass in the goaf was derived considering the rock breaking characteristics of the mining roof. The model determined the range of each water storage area, including the zone of loose body, zone of gradual load, and the compacted zone, based on the strength of the water storage capacity. The key parameters for calculating the water storage capacity were determined using a modified model for shallow thick loose layers and thin bedrock movement. Finally, a calculation method for the storage capacity was obtained. Based on the real data from the 22,615 working face of a mine in the Shendong mining area, the water storage capacity of the underground reservoir in the goaf was jointly calculated using FLAC3D, Surfer 12.0 and the proposed calculation method. The calculated water storage capacity was approximately 1.0191 million m3. Although this result was 2.20% smaller than the on-site water pumping experiment data, it still verifies the feasibility of the above calculation method for determining the water storage capacity of underground water reservoirs.
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spelling doaj.art-2e4b747fd9014095b94973fc3fc6d7532023-11-05T12:32:09ZengSpringerGeomechanics and Geophysics for Geo-Energy and Geo-Resources2363-84192363-84272023-10-019111810.1007/s40948-023-00677-2Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in ChinaZhijie Wen0Pengfei Jiang1Zhenqi Song2Yujing Jiang3Jinhao Wen4Suolin Jing5College of Energy and Mining Engineering, Shandong University of Science and TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologySchool of Civil Engineering, Qingdao University of TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologyAbstract The large-scale extraction of coal resources in the western mining areas of China has resulted in a significant loss of water resources, which is a challenge for coordinating resource extraction with ecological preservation in the mining areas. Although underground reservoir technology can effectively solve this problem, measuring the storage capacity of underground reservoirs through engineering experiments is costly and time-consuming. Currently, there is a lack of accurate, reliable, and low-cost theoretical calculation solutions, which greatly restricts the promotion and application of underground reservoir technology. The theoretical calculation methods for underground reservoir capacity were studied based on parameters from the Shendong mining area in China. A water storage structure model for coal mine underground water reservoirs was established, taking into account the settlement boundaries of the bedrock and loose layers in shallow coal seams, based on the key layer theory and the spatial structure model of the mining roof. The mathematical expression for the load on the coal-rock mass in the goaf was derived considering the rock breaking characteristics of the mining roof. The model determined the range of each water storage area, including the zone of loose body, zone of gradual load, and the compacted zone, based on the strength of the water storage capacity. The key parameters for calculating the water storage capacity were determined using a modified model for shallow thick loose layers and thin bedrock movement. Finally, a calculation method for the storage capacity was obtained. Based on the real data from the 22,615 working face of a mine in the Shendong mining area, the water storage capacity of the underground reservoir in the goaf was jointly calculated using FLAC3D, Surfer 12.0 and the proposed calculation method. The calculated water storage capacity was approximately 1.0191 million m3. Although this result was 2.20% smaller than the on-site water pumping experiment data, it still verifies the feasibility of the above calculation method for determining the water storage capacity of underground water reservoirs.https://doi.org/10.1007/s40948-023-00677-2Underground reservoirStructural modelWater storage’s capacityGoafShallow coal seam
spellingShingle Zhijie Wen
Pengfei Jiang
Zhenqi Song
Yujing Jiang
Jinhao Wen
Suolin Jing
Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Underground reservoir
Structural model
Water storage’s capacity
Goaf
Shallow coal seam
title Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
title_full Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
title_fullStr Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
title_full_unstemmed Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
title_short Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
title_sort structural model and capacity determination of underground reservoir in goaf a case study of shendong mining area in china
topic Underground reservoir
Structural model
Water storage’s capacity
Goaf
Shallow coal seam
url https://doi.org/10.1007/s40948-023-00677-2
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